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Biology Worksheet: Ecosystems, Diet, Growth - Grade 7
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Sem 2 Revision Worksheet 2024-25 Student Name: Grade & Sec: 7 Date: Subject & Topic : Biology Assessed at Grade Level : 7 Ecosystem, Diet and growth Assessed By: Teacher / Self / Peer Guidance Level: Independent Skills assessed Attainment level Recall, Understanding, Application Beginning / Acquiring / Attaining / Applying / Adapting Analysis, Evaluation, Creation Beginning / Acquiring / Attaining / Applying / Adapting 1. Draw a line to identify the main reason why each nutrient is needed. Draw only four lines. [R] 2. Peter burns a piece of crispbread to find out how much energy is stored in it. Energy from the burning crispbread raises the temperature of the water in the test-tube. 1 Sem 2 Revision Worksheet 2024-25 (a) Describe one way Peter has arranged the apparatus so that he is working safely. [U] …………………………………………………… …………………………………………………… …………………………………………………… …………………………………………………… (b) Peter wants to find out if potato crisps contain as much energy as crispbread. He does the experiment again using a piece of potato crisp. Suggest two things he must do to make the experiment a fair test. [U] 1. ................................................................................................................. 2. ................................................................................................................. (c) The table shows some of the nutritional information from a packet of crispbread and a packet of potato crisps. Peter burns 1.0 g of potato crisp instead of 1.0 g of crispbread in a similar experiment. What result will he get when he burns the potato crisp? Tick the correct answer [U] (i) The change in the temperature of the water will be greater. (ii) The change in the temperature of the water will be the same. (iii) The change in the temperature of the water will be smaller. (iv) There will be no change in the temperature of the water. 2 Sem 2 Revision Worksheet 2024-25 (d)(i) Fibre contains energy. Explain why this energy can not be used by the human body.[U] ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… (ii) Use the table in part (b) to give two reasons for choosing crispbread rather than potato crisps as part of a balanced diet. [A] ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… (e) Crispbread does not contain vitamin C. Which of the foods in the list below is the best source of vitamin C? Tick the correct box. [R] 3. The body needs iron to make red blood cells. The red blood cells transport oxygen to all the cells of the body. People who do not have enough red blood cells may feel that they do not have much energy. Explain why. [U] ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… 3 Sem 2 Revision Worksheet 2024-25 4. Part of a food web in the North Sea is shown below. Herring, sandeels and cod are types of fish. Puffins are sea birds. Herring lay eggs in the gravel on the seabed. Sandeels live where the seabed is covered with sand. Millions of cubic metres of gravel and sand are removed from the bottom of the North Sea every year for roads and buildings. (a) Describe one way removing some of the sand and gravel might cause the numbers of herring and cod to decrease. [U] ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… (b) Explain why removing some of the sand has led to a decrease in the number of puffins.[U] ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… (c) The drawing shows some of the animals which live at the bottom of the North Sea. 4 Sem 2 Revision Worksheet 2024-25 Use the diagram and suggest two advantages clams get from living in the sediment. [A] ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… 5. Jim wants to build his muscles and thus joins a gymnasium. What changes should Jim make in his diet to build strong muscles? [U] ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… 6. The information below comes from a newspaper report. Scientists measured the oxygen levels in the water upstream and downstream from Pine Bridge.The results are as shown. 5 Sem 2 Revision Worksheet 2024-25 a)(i) What was the oxygen level in the river at Pine Bridge? [U] …………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… (ii) Use the results and describe what happens to the oxygen level in the river as you travel downstream from Pine Bridge. [A] …………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… (b) Trout only live in water with oxygen levels higher than 20 ppm. How far downstream from Pine Bridge would you be likely to find trout? [An] …………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… (c)The scientists collected samples of the river animals found at different places. Trout only live in water with oxygen levels higher than 20 ppm. Give the name of one other animal that only lives in oxygen levels above 20 ppm. Use the table above and the information opposite to help you ……………………………………… ……………………………………… 6 Sem 2 Revision Worksheet 2024-25 (d) In the river, trout are predators. Near Pine Bridge, the number of trout decreased. Evaluate one reason why pollution may cause the trout population to decrease. [Ev] …………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… 7. A scientist wants to record the number of dandelion plants in the grassland area. Describe how they could use a 1m2 quadrat to estimate the number of dandelions growing in the grassland area. [A] …………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… 8. The table shows the recommended daily intake of energy and some of the nutrients needed by different groups of people. 7 Sem 2 Revision Worksheet 2024-25 a. (i) Examine the data and explain why two 16 year-old males of the same weight might need different amounts of energy. [An] …………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… (ii) Which two types of nutrient provide most of the energy in our diet? [U] …………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… (iii) Calculate the difference in the recommended daily intake of calcium for a 15 year-old male and a 30 year-old male. [A] (iv) Calcium is needed for healthy bones. Use the data and explain the difference in the amount of calcium needed each day by a 15 year-old male and a 30 year-old male. [A] …………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… 8 Sem 2 Revision Worksheet 2024-25 9. Justify how the Iodine test can be used in a quality control setting in the food industry to ensure the consistency of nutritional content across batches of a product? [Ev] …………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… 10. Design a method to test for the presence of starch in a mixture of multiple food ingredients (e.g., a casserole or salad) while ensuring no interference from other components. [Cr] …………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ………………………………END OF THE DOCUMENT……………………………………………. 9
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